What is the primary role of intrinsic factor in vitamin absorption?
It assists in the absorption of vitamin A in the liver.
It aids in the absorption of vitamin D in the kidneys.
It helps in the absorption of vitamin C in the stomach.
It binds to vitamin B12 to facilitate its absorption in the ileum.
The Correct Answer is D
A. It assists in the absorption of vitamin A in the liver: Vitamin A is a fat-soluble vitamin absorbed with dietary fats; the liver is a storage site, but intrinsic factor is not involved.
B. It aids in the absorption of vitamin D in the kidneys: Vitamin D is synthesized in the skin and activated in the kidneys; intrinsic factor plays no role in its metabolism.
C. It helps in the absorption of vitamin C in the stomach: Vitamin C is a water-soluble vitamin absorbed primarily in the small intestine via active transport, independent of intrinsic factor.
D. It binds to vitamin B12 to facilitate its absorption in the ileum: Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach. It must bind to B12 to protect it from digestion and allow it to be absorbed in the terminal ileum.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Fluid accumulation in alveoli: Pulmonary edema involves fluid leaking into the air sacs (alveoli). This creates a physical barrier that oxygen must pass through to reach the blood, severely impairing gas exchange.
B. Increased alveolar surface tension: While surfactant may be diluted, the primary cause of the gas exchange failure is the presence of the fluid itself.
C. Enhanced alveolar ventilation: Ventilation is severely decreased because the alveoli are filled with fluid instead of air.
D. Decreased alveolar capillary permeability: In many types of pulmonary edema (like ARDS), permeability is actually increased, causing the leak.
Correct Answer is B
Explanation
A. Collecting duct: The collecting duct handles water and electrolyte fine-tuning, not large molecule filtration.
B. Glomerulus: The glomerular filtration membrane acts as a sieve. Normally, it is too fine to allow large proteins (like albumin) to pass. If protein is in the urine, it indicates the glomerular "sieve" is damaged.
C. Distal convoluted tubule: This part of the nephron deals with secretion and reabsorption of ions, not protein filtration.
D. Loop of Henle: This area focuses on the concentration of urine through salt and water transport.
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